Says my .gif files is not a gif. – GIF Upload for Instagram - upload your gifs to Ins Review

I just downloaded this app, opened it, it said I have 2 gifs out of 280 photos, which is correct. I click to show "Gif Only" which shows my my 2 .gif files. I click on the one I want to convert to share on Instagram and I get an error message saying "this is not a gif. Please select a gif."
Review by Brittany Witt on GIF Upload for Instagram - upload your gifs to Ins.